<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>剩余参数</title>
</head>

<body>
  <script>
    // 剩余参数   ...
    // 剩余参数是一个真数组
    function getSum(...arr) {
      let sum = 0
      for (let i = 0; i < arr.length; i++) {
        sum += arr[i]
      }
      console.log(sum);
    }
    getSum(2, 3)
  </script>
</body>

</html>